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Medulla Ratio Formula:
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The medulla ratio is a measurement used in hair analysis that compares the diameter of the medulla (the central core of a hair) to the overall diameter of the hair. This ratio is important in forensic science and anthropology for species identification and hair characterization.
The calculator uses the medulla ratio formula:
Where:
Explanation: The ratio provides a standardized measurement that helps classify hair types and identify species based on hair characteristics.
Details: The medulla ratio is crucial in forensic investigations for human vs. animal hair identification, in anthropological studies of hair characteristics across populations, and in textile industry for quality control of animal fibers.
Tips: Enter both medulla diameter and hair diameter in micrometers (μm). Both values must be positive numbers. The calculator will compute the ratio which typically ranges from 0 to 1.
Q1: What is a typical medulla ratio for human hair?
A: Human hair typically has a medulla ratio less than 0.5, with many human hairs having no medulla at all (ratio of 0).
Q2: How does animal hair differ in medulla ratio?
A: Animal hairs often have higher medulla ratios, frequently greater than 0.5, and the medulla is usually more prominent and continuous.
Q3: How should hair measurements be taken?
A: Measurements should be taken using a calibrated microscope with precise measurement capabilities, typically at 400x magnification.
Q4: Can medulla ratio vary within the same hair?
A: Yes, the medulla ratio can vary along the length of a single hair, so multiple measurements may be needed for accurate characterization.
Q5: What factors affect medulla ratio?
A: Factors include species, hair type (head, body, facial), age of the individual, and health/nutritional status.